Holo-krome 730001820 Hex Socket Cap Screw 3/8-24 Unf

Product Description

The HOLO-KROME 730001820 is a partially threaded hex socket cap screw designed for high-strength fastening applications across industrial, mechanical, and trade installations. It features a 3/8-24 UNF thread size and measures 4.5 inches in length under the head. Driven with a 5/16-inch hex key, this cap screw is manufactured from alloy steel and finished with a black oxide coating for corrosion resistance. It conforms to ASME B18.3 and ASTM A574 standards, making it a code-compliant choice for structural and mechanical assemblies where tensile strength and dimensional accuracy are critical.

This screw is suited for use in machinery, equipment frames, HVAC components, electrical enclosures, and general mechanical assemblies where a recessed-drive, high-strength fastener is required. The partial threading allows for positive clamping force against a mating surface without thread engagement through the full grip length, which is typical in through-bolt and clearance-hole applications. It is installed by licensed mechanics, millwrights, and trade professionals working on equipment requiring precision fastening.

Key Features

• 3/8-24 UNF thread for fine-pitch, high-strength engagement
• 4.5-inch length under head accommodates substantial grip lengths
• Partially threaded shank provides positive clamping in clearance-hole applications
• 5/16-inch hex socket drive for use with standard hex keys or Allen bits
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style and replacement hex socket cap screw for mechanical assemblies requiring a 3/8-24 UNF partially threaded fastener conforming to ASME B18.3 and ASTM A574 specifications.

Installation Notes

Installation should be performed by qualified mechanics or trade professionals using a calibrated hex key or socket driver sized at 5/16 inch. Ensure the mating threaded hole or nut is free of debris and correctly tapped to 3/8-24 UNF before installation. Do not substitute an impact driver without a proper hex bit holder rated for the fastener size. Follow applicable equipment manufacturer torque specifications for the assembly being serviced.